1) 3^10 * 3^(-8) = 3^(10+(-8)) = 3^(10-8) = 3^2 = 9
2) 10^(-3) : 10^(-5) = 10^(-3-(-5)) = 10^(-3+5) = 10^2 = 100
3) (2^(-3))^(-1) = 2^(-3*(-1)) = 2^3 = 8
4) 11^15 * 11^(-13) = 11^(15+(-13)) = 11^(15-13) = 11^2 = 121
1) 3^10 * 3^(-8) = 3^(10+(-8)) = 3^(10-8) = 3^2 = 9
2) 10^(-3) : 10^(-5) = 10^(-3-(-5)) = 10^(-3+5) = 10^2 = 100
3) (2^(-3))^(-1) = 2^(-3*(-1)) = 2^3 = 8
4) 11^15 * 11^(-13) = 11^(15+(-13)) = 11^(15-13) = 11^2 = 121